<!DOCTYPE html> 
<html> 
<body> 
<div id="Container" style="background-color:silver; width:150px; float:left;">
	<div id="Float" style="float:right; width:100px; height:100px; background-color: green;">Float</div>
	<div id="Clear" style="clear:right; float:left; width:100px; height:100px;background-color:yellow;filter:alpha(opacity=50);-moz-opacity:0.5; opacity: 0.5;">Clear</div>
</div>
</body> 
</html>